﻿81 
  1 
  PALEONTOLOGY 
  OF 
  ILLINu: 
  S 
  

  

  Radials 
  longer 
  than 
  wide, 
  lateral 
  borders 
  nearly 
  Btraight, 
  slightly 
  

   contracted 
  ft! 
  nrnmits, 
  the 
  articulating 
  Boar 
  for 
  the 
  reeeption 
  

  

  of 
  the 
  brachial 
  series 
  occupying 
  about 
  one 
  third 
  of 
  the 
  width 
  of 
  

   their 
  upper 
  mari 
  

  

  Brachial 
  platea 
  small, 
  apparently 
  two 
  in 
  number, 
  the 
  Becond 
  

   being 
  the 
  Longest, 
  and 
  supporting 
  on 
  its 
  upper 
  slop;: 
  - 
  the 
  first 
  

  

  arm 
  plat 
  

  

  Anus 
  two 
  to 
  each 
  ray, 
  composed 
  of 
  short, 
  rounded 
  joints, 
  which 
  

   give 
  oil 
  Btrong 
  pinnules 
  from 
  their 
  inner 
  borders. 
  Anal 
  side 
  and 
  

   column 
  unknown. 
  The 
  surfaces 
  of 
  the 
  body 
  plates 
  are 
  marked 
  by 
  

  

  ire 
  longitudinal 
  ridges 
  that 
  will 
  serve 
  to 
  distinguish 
  t: 
  

   from 
  any 
  utlur 
  heretofore 
  described 
  from 
  this 
  horizon. 
  

  

  Position 
  <i»J 
  locality: 
  Upper 
  part 
  of 
  the 
  Keokuk 
  limestone, 
  Hamil- 
  

   ton, 
  111. 
  

  

  No. 
  14 
  of 
  Mr. 
  L. 
  A. 
  Cox's 
  collection. 
  

  

  Genus 
  TALABOCKENTJS, 
  Waebs. 
  A 
  Bpr. 
  

  

  Talakoikims 
  ovatub, 
  Worthen. 
  

   pl 
  x\i\. 
  n» 
  u. 
  

  

  ; 
  •■!... 
  1882. 
  

  

  Bulletin 
  No 
  i. 
  "f 
  the 
  Dlinola 
  - 
  "T. 
  p- 
  *• 
  

  

  Body 
  above 
  the 
  medium 
  aize, 
  ovate 
  in 
  general 
  outline, 
  locate 
  as 
  

   viewed 
  from 
  above 
  or 
  below. 
  

  

  alfl 
  about 
  half 
  as 
  high 
  as 
  wide, 
  impressed 
  below, 
  and 
  pen 
  

  

  onal 
  above, 
  with 
  a 
  alight 
  depression 
  at 
  their 
  lateral 
  bord< 
  

  

  adials 
  aboul 
  one-third 
  longer 
  than 
  wide, 
  the 
  ant. 
  - 
  

   pentangular, 
  the 
  others 
  Quadrangular, 
  and 
  all 
  protuberant. 
  Hie 
  

   Anew 
  radials 
  not 
  visible. 
  

  

  The 
  firsl 
  anal 
  Is 
  a- 
  largo 
  or 
  n 
  little 
  larger 
  than 
  the 
  firs! 
  red 
  

   heptagons!, 
  having 
  four 
  diatinot 
  angles 
  above 
  and 
  three 
  below. 
  It 
  

   , 
  by 
  three 
  -mall 
  anals, 
  the 
  oentral 
  one 
  of 
  which 
  is 
  

   :::l 
  l, 
  and 
  D 
  the 
  truncated 
  Bumroit 
  of 
  tin- 
  Bret 
  anal, 
  while 
  

  

  lie 
  form 
  of 
  which 
  can 
  not 
  I 
  upon 
  

  

  ipper 
  lateral 
  angles. 
  Abm 
  there 
  is 
  on.' 
  <- 
  r 
  two 
  

  

  nail 
  plates 
  surrounding 
  the 
  anal 
  opeoii 
  

   The 
  \auit 
  i^ 
  oomposed 
  of 
  very 
  until, 
  smooth 
  pl 
  the 
  

  

  which 
  is 
  larger, 
  and 
  produced 
  into 
  a 
  pointed 
  spun 
  

   mi 
  as 
  u 
  ■ 
  between 
  the 
  arm 
  

  

  